render_replaced.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

/**
 * This file is part of the HTML widget for KDE.
 *
 * Copyright (C) 1999-2003 Lars Knoll ([e-mail])
 * Copyright (C) 2000-2003 Dirk Mueller ([e-mail])
 * Copyright (C) 2003 Apple Computer, Inc.
 * Copyright (C) 2004 Germain Garand ([e-mail])
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */
#include "render_replaced.h"
#include "render_canvas.h"
#include "render_line.h"

#include "render_arena.h"

#include <assert.h>
#include <qwidget.h>
#include <qpainter.h>
#include <qevent.h>
#include <qapplication.h>
#include <qlineedit.h>
#include <kglobalsettings.h>
#include <qobjectlist.h>
#include <qvaluevector.h>

#include "khtml_ext.h"
#include "khtmlview.h"
#include "xml/dom2_eventsimpl.h"
#include "khtml_part.h"
#include "xml/dom_docimpl.h"
#include <kdebug.h>

bool khtml::allowWidgetPaintEvents = false;

using namespace khtml;
using namespace DOM;


RenderReplaced::RenderReplaced(DOM::NodeImpl* node)
    : RenderBox(node)
{
    // init RenderObject attributes
    setReplaced(true);

    m_intrinsicWidth = 200;
    m_intrinsicHeight = 150;
}

void RenderReplaced::calcMinMaxWidth()
{
    KHTMLAssert( !minMaxKnown());

#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << "RenderReplaced::calcMinMaxWidth() known=" << minMaxKnown() << endl;
#endif

    m_width = calcReplacedWidth();
    m_width = calcBoxWidth( m_width );

    if ( style()->width().isPercent() || style()->height().isPercent() || 
		    style()->maxWidth().isPercent() || style()->maxHeight().isPercent() ||
		    style()->minWidth().isPercent() || style()->minHeight().isPercent() ) {
        m_minWidth = 0;
        m_maxWidth = m_width;
    }
    else
        m_minWidth = m_maxWidth = m_width;

    setMinMaxKnown();
}

void RenderReplaced::position(InlineBox* box, int /*from*/, int /*len*/, bool /*reverse*/)
{
    setPos( box->xPos(), box->yPos() );
}

// -----------------------------------------------------------------------------

RenderWidget::RenderWidget(DOM::NodeImpl* node)
        : RenderReplaced(node)
{
    m_widget = 0;
    // a widget doesn't support being anonymous
    assert(!isAnonymous());
    m_view = node->getDocument()->view();
    m_resizePending = false;
    m_discardResizes = false;

    // this is no real reference counting, its just there
    // to make sure that we're not deleted while we're recursed
    // in an eventFilter of the widget
    ref();
}

void RenderWidget::detach()
{
    remove();
    deleteInlineBoxes();

    if ( m_widget ) {
        if ( m_view ) {
            m_view->setWidgetVisible(this, false);
            m_view->removeChild( m_widget );
        }

        m_widget->removeEventFilter( this );
        m_widget->setMouseTracking( false );
    }

    deref();
}

RenderWidget::~RenderWidget()
{
    KHTMLAssert( refCount() <= 0 );

    if(m_widget) {
        m_widget->hide();
        m_widget->deleteLater();
    }
}

class QWidgetResizeEvent : public QEvent
{
public:
    enum { Type = QEvent::User + 0xbee };
    QWidgetResizeEvent( int _w,  int _h ) :
        QEvent( ( QEvent::Type ) Type ),  w( _w ), h( _h ) {}
    int w;
    int h;
};

void  RenderWidget::resizeWidget( int w, int h )
{
    // ugly hack to limit the maximum size of the widget ( as X11 has problems if
    // its bigger )
    h = kMin( h, 3072 );
    w = kMin( w, 2000 );

    if (m_widget->width() != w || m_widget->height() != h) {
        m_resizePending = !strcmp(m_widget->name(), "__khtml");
        ref();
        element()->ref();
        QApplication::postEvent( this, new QWidgetResizeEvent( w, h ) );
        element()->deref();
        deref();
    }
}

void RenderWidget::cancelPendingResize()
{
    if (!m_widget)
        return;
    m_discardResizes = true;
    QApplication::sendPostedEvents(this, QWidgetResizeEvent::Type);
    m_discardResizes = false;
}

bool RenderWidget::event( QEvent *e )
{
    if ( m_widget && (e->type() == (QEvent::Type)QWidgetResizeEvent::Type) ) {
        m_resizePending = false;
        if (m_discardResizes)
            return true;
        QWidgetResizeEvent *re = static_cast<QWidgetResizeEvent *>(e);
        m_widget->resize( re->w,  re->h );
        repaint();
    }
    // eat all events - except if this is a frame (in which case KHTMLView handles it all)
    if ( ::qt_cast<KHTMLView *>( m_widget ) )
        return QObject::event( e );
    return true;
}

void RenderWidget::flushWidgetResizes() //static
{
    QApplication::sendPostedEvents( 0, QWidgetResizeEvent::Type );
}

void RenderWidget::setQWidget(QWidget *widget)
{
    if (widget != m_widget)
    {
        if (m_widget) {
            m_widget->removeEventFilter(this);
            disconnect( m_widget, SIGNAL( destroyed()), this, SLOT( slotWidgetDestructed()));
            delete m_widget;
            m_widget = 0;
        }
        m_widget = widget;
        if (m_widget) {
            connect( m_widget, SIGNAL( destroyed()), this, SLOT( slotWidgetDestructed()));
            m_widget->installEventFilter(this);

            if ( !strcmp(m_widget->name(), "__khtml") && !::qt_cast<QFrame*>(m_widget))
                m_widget->setBackgroundMode( QWidget::NoBackground );

            if (m_widget->focusPolicy() > QWidget::StrongFocus)
                m_widget->setFocusPolicy(QWidget::StrongFocus);
            // if we've already received a layout, apply the calculated space to the
            // widget immediately, but we have to have really been full constructed (with a non-null
            // style pointer).
            if (!needsLayout() && style()) {
                resizeWidget( m_width-borderLeft()-borderRight()-paddingLeft()-paddingRight(),
                              m_height-borderTop()-borderBottom()-paddingTop()-paddingBottom() );
            }
            else
                setPos(xPos(), -500000);
        }
        m_view->setWidgetVisible(this, false);
        m_view->addChild( m_widget, 0, -500000);
        if ( m_widget ) m_widget->hide();
        m_resizePending = false;
    }
}

void RenderWidget::layout( )
{
    KHTMLAssert( needsLayout() );
    KHTMLAssert( minMaxKnown() );
    if ( m_widget )
        resizeWidget( m_width-borderLeft()-borderRight()-paddingLeft()-paddingRight(),
                      m_height-borderTop()-borderBottom()-paddingTop()-paddingBottom() );

    setNeedsLayout(false);
}

void RenderWidget::updateFromElement()
{
    if (m_widget) {
        // Color:
        QColor color = style()->color();
        QColor backgroundColor = style()->backgroundColor();

        if ( color.isValid() || backgroundColor.isValid() ) {
            QPalette pal(QApplication::palette(m_widget));

            int contrast_ = KGlobalSettings::contrast();
            int highlightVal = 100 + (2*contrast_+4)*16/10;
            int lowlightVal = 100 + (2*contrast_+4)*10;

            if (backgroundColor.isValid()) {
                if (strcmp(widget()->name(), "__khtml"))
                    widget()->setEraseColor(backgroundColor );
                for ( int i = 0; i < QPalette::NColorGroups; ++i ) {
                    pal.setColor( (QPalette::ColorGroup)i, QColorGroup::Background, backgroundColor );
                    pal.setColor( (QPalette::ColorGroup)i, QColorGroup::Light, backgroundColor.light(highlightVal) );
                    pal.setColor( (QPalette::ColorGroup)i, QColorGroup::Dark, backgroundColor.dark(lowlightVal) );
                    pal.setColor( (QPalette::ColorGroup)i, QColorGroup::Mid, backgroundColor.dark(120) );
                    pal.setColor( (QPalette::ColorGroup)i, QColorGroup::Midlight, backgroundColor.light(110) );
                    pal.setColor( (QPalette::ColorGroup)i, QColorGroup::Button, backgroundColor );
                    pal.setColor( (QPalette::ColorGroup)i, QColorGroup::Base, backgroundColor );
            }
            }
            if ( color.isValid() ) {
                struct ColorSet {
                    QPalette::ColorGroup cg;
                    QColorGroup::ColorRole cr;
                };
                const struct ColorSet toSet [] = {
                    { QPalette::Active, QColorGroup::Foreground },
                    { QPalette::Active, QColorGroup::ButtonText },
                    { QPalette::Active, QColorGroup::Text },
                    { QPalette::Inactive, QColorGroup::Foreground },
                    { QPalette::Inactive, QColorGroup::ButtonText },
                    { QPalette::Inactive, QColorGroup::Text },
                    { QPalette::Disabled,QColorGroup::ButtonText },
                    { QPalette::NColorGroups, QColorGroup::NColorRoles },
                };
                const ColorSet *set = toSet;
                while( set->cg != QPalette::NColorGroups ) {
                    pal.setColor( set->cg, set->cr, color );
                    ++set;
                }

                QColor disfg = color;
                int h, s, v;
                disfg.hsv( &h, &s, &v );
                if (v > 128)
                    // dark bg, light fg - need a darker disabled fg
                    disfg = disfg.dark(lowlightVal);
                else if (disfg != Qt::black)
                    // light bg, dark fg - need a lighter disabled fg - but only if !black
                    disfg = disfg.light(highlightVal);
                else
                    // black fg - use darkgray disabled fg
                    disfg = Qt::darkGray;
                pal.setColor(QPalette::Disabled,QColorGroup::Foreground,disfg);
            }

            m_widget->setPalette(pal);
        }
        else
            m_widget->unsetPalette();
        // Border:
        QFrame* frame = ::qt_cast<QFrame*>(m_widget);
        if (frame) {
            if (shouldPaintBackgroundOrBorder())
            {
                frame->setFrameShape(QFrame::NoFrame);
            }
        }

    }

    RenderReplaced::updateFromElement();
}

void RenderWidget::slotWidgetDestructed()
{
    if (m_view)
       m_view->setWidgetVisible(this, false);
    m_widget = 0;
}

void RenderWidget::setStyle(RenderStyle *_style)
{
    RenderReplaced::setStyle(_style);
    if(m_widget)
    {
        m_widget->setFont(style()->font());
        if (style()->visibility() != VISIBLE) {
            if (m_view)
                m_view->setWidgetVisible(this, false);
            m_widget->hide();
        }
    }

    // Don't paint borders if the border-style is native
    // or borders are not supported on this widget
    if (!canHaveBorder() ||
        (style()->borderLeftStyle()   == BNATIVE &&
         style()->borderRightStyle()  == BNATIVE &&
         style()->borderTopStyle()    == BNATIVE &&
         style()->borderBottomStyle() == BNATIVE))
    {
        setShouldPaintBackgroundOrBorder(false);
    }
}

void RenderWidget::paint(PaintInfo& paintInfo, int _tx, int _ty)
{
    _tx += m_x;
    _ty += m_y;
 
    if (shouldPaintBackgroundOrBorder() && 
          (paintInfo.phase == PaintActionChildBackground || paintInfo.phase == PaintActionChildBackgrounds))
        paintBoxDecorations(paintInfo, _tx, _ty);

    if (!m_widget || !m_view || paintInfo.phase != PaintActionForeground)
        return;

    // not visible or not even once layouted
    if (style()->visibility() != VISIBLE || m_y <= -500000 || m_resizePending )
        return;

    if ( (_ty > paintInfo.r.bottom()) || (_ty + m_height <= paintInfo.r.top()) ||
         (_tx + m_width <= paintInfo.r.left()) || (_tx > paintInfo.r.right()) )
        return;

    int xPos = _tx+borderLeft()+paddingLeft();
    int yPos = _ty+borderTop()+paddingTop();

    bool khtmlw = !strcmp(m_widget->name(), "__khtml");
    int childw = m_widget->width();
    int childh = m_widget->height();
    if ( (childw == 2000 || childh == 3072) && m_widget->inherits( "KHTMLView" ) ) {
        KHTMLView *vw = static_cast<KHTMLView *>(m_widget);
        int cy = m_view->contentsY();
        int ch = m_view->visibleHeight();


        int childx = m_view->childX( m_widget );
        int childy = m_view->childY( m_widget );

        int xNew = xPos;
        int yNew = childy;

        //         qDebug("cy=%d, ch=%d, childy=%d, childh=%d", cy, ch, childy, childh );
        if ( childh == 3072 ) {
            if ( cy + ch > childy + childh ) {
                yNew = cy + ( ch - childh )/2;
            } else if ( cy < childy ) {
                yNew = cy + ( ch - childh )/2;
            }
//             qDebug("calculated yNew=%d", yNew);
        }
        yNew = kMin( yNew, yPos + m_height - childh );
        yNew = kMax( yNew, yPos );
        if ( yNew != childy || xNew != childx ) {
            if ( vw->contentsHeight() < yNew - yPos + childh )
                vw->resizeContents( vw->contentsWidth(), yNew - yPos + childh );
            vw->setContentsPos( xNew - xPos, yNew - yPos );
        }
        xPos = xNew;
        yPos = yNew;
    }
    m_view->setWidgetVisible(this, true);
    m_view->addChild(m_widget, xPos, yPos );
    m_widget->show();
    if (khtmlw)
        paintWidget(paintInfo, m_widget, xPos, yPos);
}

#include <private/qinternal_p.h>

// The PaintBuffer class provides a shared buffer for widget painting.
//
// It will grow to encompass the biggest widget encountered, in order to avoid
// constantly resizing.
// When it grows over maxPixelBuffering, it periodically checks if such a size
// is still needed.  If not, it shrinks down to the biggest size < maxPixelBuffering
// that was requested during the overflow lapse.

class PaintBuffer: public QObject
{